One-bath dyeing process of vegetable dyes with different pH values

Abstract

The invention provides a one-bath dyeing process of vegetable dyes with different pH values, and relates to the technical field of textile printing and dyeing. The one-bath dyeing process of the vegetable dyes with different pH values comprises the following specific steps: step 1, preparing a dye solution: adding a surfactant into the dye solution, changing the state of dye molecules in an aqueous solution, playing a role in retarding dyeing so as to ensure the uniform dispersion and the optimal dyeing effect of the dyes, and heating to increase the dyeing temperature, so that the dyeing time is shortened; by adding the surfactant and heating, the dyeing balance is facilitated; the prepared fabric is soaked in the dye liquor for dyeing, and the dyeing temperature and time parameters need to be controlled in the dyeing process so that it can be guaranteed that dye can fully permeate into the fabric. According to the present invention, the one-bath dyeing process can be performed by using the two vegetable dyes with different pH dyeing conditions in the same dye bath, such that the process flow can be shortened, the production efficiency can be improved, the adjustment is easy, and the dyeing reproducibility can be improved;

Description

Technical Field

[0001] The invention relates to the technical field of textile printing and dyeing, in particular to a one-bath dyeing process of plant dyes with different pH values. Background Art

[0002] With the continuous and rapid development of China's economy, the continuous increase in urbanization and industrialization, environmental pollution is becoming increasingly serious, and the country is paying more and more attention to environmental protection. The textile printing and dyeing industry, especially the dyeing process, will inevitably be accompanied by a large amount of dyeing wastewater and CO2 emissions, which is a major problem for environmental protection and carbon reduction projects. Plant dyes, because they are extracted from plants, can be degraded, and are better for human health than chemical dyes. Therefore, the study of plant dyeing is also an important topic.

[0003] At present, there are many shortcomings in the dyeing process of plant dyes. Plant dyes are naturally grown organic compounds with complex structures and poor controllability. Moreover, due to the molecular structure, they will show different acidity and alkalinity. This determines that there are different electrical states in the same dye bath, and the affinity to wool fibers is different. Therefore, the dyeing will have the problem of unbalanced dyeing, and it is not easy to reproduce the desired color.

[0004] Studying how to balance the dyeing of plant dyes under different pH conditions under one-bath dyeing process is an important task in the field of plant dyeing. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the present invention provides a one-bath dyeing process for plant dyes with different pH values, which solves the problem that different acidity and alkalinity are presented due to the molecular structure. This determines that there are different electrical states in the same dye bath, and the affinity to wool fibers is different, so the dyeing will have an unbalanced dyeing problem.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention is implemented by the following technical scheme: a one-bath dyeing process of plant dyes with different pH values, comprising the following specific steps:

[0009] Step 1:

[0010] Preparation of dye solution: adding surfactant to the dye solution to change the state of dye molecules in the aqueous solution and play a role in slow dyeing to ensure uniform dispersion of the dye and the best dyeing effect, and raising the dyeing temperature by heating, and adding surfactant and heating are beneficial to the dyeing balance;

[0011] Step 2:

[0012] Dyeing operation: soak the prepared fabric in the dye solution for dyeing. During the dyeing process, the dyeing temperature and time parameters need to be controlled to ensure that the dye can fully penetrate into the fabric. The dyeing temperature is 70-80℃ and the time is 30min.

[0013] Step 3:

[0014] Heating treatment: The dyed fabric is heated to fix the color of the dye on the fabric and dry the dye liquid on the surface of the dyed fabric;

[0015] Step 4:

[0016] Washing treatment: Color-fixing fabrics need to be washed to remove residual dyes and auxiliaries, and to achieve the desired appearance and performance of the fabric. Washing can improve the cleanliness of color-fixing fabrics.

[0017] Step 5:

[0018] Drying treatment: After washing, the fabric will be dried by heating it in a drying oven to 50-70℃ for 15-30 minutes to dry the dye on the fabric;

[0019] Step 6:

[0020] Quality Control: Observe the overall finish of the vegetable dyed fabric after drying to ensure uniformity of dyeing, color stability, and physical properties of the fabric.

[0021] Preferably, in the dyeing process of step 1, the amount of surfactant added is 1-2 g / L, so that the plant dye can be fully dissolved in the dye bath.

[0022] Preferably, the dyeing temperature is controlled in step one and step two, and two different types of plant dyes are dyed in balance under the same temperature condition.

[0023] Preferably, the pH value of the solution in step 1 is weakly acidic or neutral, and the pH value is 5-7.

[0024] Preferably, in the step 4, the water washing treatment has an initial water washing temperature of 50-60°C and a time of 10-20 min; a soap washing temperature of 90-100°C and a time of 15-25 min; and a second washing temperature of 30-40°C and a time of 5-15 min.

[0025] Preferably, the heating time of the heating treatment in step three is 20 minutes and the temperature is 35-55°C.

[0026] (III) Beneficial effects

[0027] The present invention provides a one-bath dyeing process for plant dyes with different pH values. It has the following beneficial effects:

[0028] 1. The present invention uses different types of plant dyes, which often have different pH values ​​due to their different molecular structures, so that their dyeing must be done under dye bath conditions with different pH values, and thus cannot meet the needs of one-bath dyeing. The present invention provides a process for one-bath dyeing of plant dyes with two different pH dyeing conditions in the same dye bath, which can shorten the process flow, improve production efficiency, and is easy to adjust, and the dyeing reproducibility is improved.

[0029] 2. The present invention realizes a one-bath dyeing process by using plant dyes with different pH values ​​in the same dye bath, which can greatly save time and cost compared with the original two-bath dyeing process, and the controllability of dyeing is improved, which is of great significance in the field of plant dye dyeing. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] The embodiment of the present invention provides a one-bath dyeing process of plant dyes with different pH values, comprising the following specific steps:

[0033] Step 1:

[0034] Preparation of dye solution: adding surfactant to the dye solution to change the state of dye molecules in the aqueous solution and play a role in slow dyeing to ensure uniform dispersion of the dye and the best dyeing effect, and increasing the dyeing temperature by heating. Adding surfactant and heating is conducive to dyeing balance. The amount of surfactant added in the dyeing process is 1g / L, so that the plant dye can be fully dissolved in the dye bath. The pH value of the solution is weakly acidic or neutral, and the pH value is 5. The one-bath dyeing process of plant dyes with different pH values ​​in the same dye bath can be realized, which can greatly save time and cost compared with the original two-bath dyeing, and the controllability of dyeing can be improved;

[0035] Step 2:

[0036] Dyeing operation: soak the prepared fabric in the dye solution for dyeing. During the dyeing process, the dyeing temperature and time parameters need to be controlled to ensure that the dye can fully penetrate into the fabric. The dyeing temperature is 70°C for 30 minutes. The dyeing temperature is controlled and two different types of plant dyes are dyed in balance under the same temperature conditions.

[0037] Step 3:

[0038] Heating treatment: The dyed fabric is heated and fixed after dyeing to fix the color of the dye on the fabric, and the dye liquid on the surface of the dyed fabric is dried. The heating time of the heating treatment is 20 minutes and the temperature is 35°C. The dye can be fully fixed on the surface of the fabric through the predetermined time and temperature to complete the dyeing process;

[0039] Step 4:

[0040] Washing treatment: Color-fixing fabrics need washing treatment to remove residual dyes and auxiliaries, and make the fabrics reach the required appearance and performance. Washing can improve the cleanliness of color-fixing fabrics. In step 4, the initial washing temperature is 50°C and the time is 10 minutes; the soap washing temperature is 70°C and the time is 15 minutes; the second washing temperature is 30°C and the time is 5 minutes. Through repeated washing, the residual can be removed first, and the auxiliaries can be cleaned. Secondly, it can be detected whether there is a problem of dye withdrawal after the dye is heated after fixing.

[0041] Step 5:

[0042] Drying treatment: After washing, the fabric will be dried by heating it in a drying oven to 50°C for 15 minutes to dry the dye on the fabric. The drying effect of the fabric can be maintained to the greatest extent by controlling the heating temperature and time.

[0043] Step 6:

[0044] Quality control: After drying, observe the overall completion of the plant dyed fabric to ensure the uniformity of dyeing, color stability and physical properties of the fabric. Through the one-bath dyeing process of the plant dyes under the PH dyeing conditions in step one in the same dye bath, the process flow can be shortened, production efficiency can be improved, and it is easy to adjust, and the dyeing reproducibility is improved.

[0045] Embodiment 2:

[0046] The embodiment of the present invention provides a one-bath dyeing process of plant dyes with different pH values, comprising the following specific steps:

[0047] Step 1:

[0048] Preparation of dye solution: adding surfactant to the dye solution to change the state of dye molecules in the aqueous solution and play a role in slow dyeing to ensure uniform dispersion of the dye and the best dyeing effect, and increasing the dyeing temperature by heating. Adding surfactant and heating is conducive to dyeing balance. The amount of surfactant added in the dyeing process is 1.5g / L, so that the plant dye can be fully dissolved in the dye bath. The pH value of the solution is weakly acidic or neutral, and the pH value is 6. The one-bath dyeing process of plant dyes with different pH values ​​in the same dye bath can be realized, which can greatly save time and cost compared with the original two-bath dyeing, and the controllability of dyeing can be improved;

[0049] Step 2:

[0050] Dyeing operation: soak the prepared fabric in the dye solution for dyeing. During the dyeing process, the dyeing temperature and time parameters need to be controlled to ensure that the dye can fully penetrate into the fabric. The dyeing temperature is 75°C for 30 minutes. The dyeing temperature is controlled and two different types of plant dyes are dyed in balance under the same temperature conditions.

[0051] Step 3:

[0052] Heating treatment: The dyed fabric is heated and fixed after dyeing to fix the color of the dye on the fabric, and the dye liquid on the surface of the dyed fabric is dried. The heating time of the heating treatment is 20 minutes and the temperature is 40°C. The dye can be fully fixed on the surface of the fabric through the predetermined time and temperature to complete the dyeing process;

[0053] Step 4:

[0054] Washing treatment: Color-fixing fabrics need washing treatment to remove residual dyes and auxiliaries, and make the fabrics reach the required appearance and performance. Washing can improve the cleanliness of color-fixing fabrics. In step 4, the initial washing temperature is 55°C and the time is 15 minutes; the soap washing temperature is 75°C and the time is 20 minutes; the second washing temperature is 35°C and the time is 10 minutes. Through repeated washing, the residual can be removed first, and the auxiliaries can be cleaned. Secondly, it can be detected whether there is a problem of dye withdrawal after the dye is heated after fixing.

[0055] Step 5:

[0056] Drying treatment: The washed fabric will be dried by heating it in a drying oven to 60°C for 20 minutes to dry the dye on the fabric. The drying effect of the fabric can be maintained to the greatest extent by controlling the heating temperature and time.

[0057] Step 6:

[0058] Quality control: After drying, observe the overall completion of the plant dyed fabric to ensure the uniformity of dyeing, color stability and physical properties of the fabric. Through the one-bath dyeing process of the plant dyes under the PH dyeing conditions in step one in the same dye bath, the process flow can be shortened, production efficiency can be improved, and it is easy to adjust, and the dyeing reproducibility is improved.

[0059] Embodiment three:

[0060] The embodiment of the present invention provides a one-bath dyeing process of plant dyes with different pH values, comprising the following specific steps:

[0061] Step 1:

[0062] Preparation of dye solution: adding surfactant to the dye solution to change the state of dye molecules in the aqueous solution and play a role in slow dyeing to ensure uniform dispersion of the dye and the best dyeing effect, and increasing the dyeing temperature by heating. Adding surfactant and heating is conducive to dyeing balance. The amount of surfactant added in the dyeing process is 1.8g / L, so that the plant dye can be fully dissolved in the dye bath. The pH value of the solution is weakly acidic or neutral, and the pH value is 7. The one-bath dyeing process of plant dyes with different pH values ​​in the same dye bath can be realized, which can greatly save time and cost compared with the original two-bath dyeing, and the controllability of dyeing can be improved;

[0063] Step 2:

[0064] Dyeing operation: soak the prepared fabric in the dye solution for dyeing. During the dyeing process, the dyeing temperature and time parameters need to be controlled to ensure that the dye can fully penetrate into the fabric. The dyeing temperature is 77°C for 30 minutes. The dyeing temperature is controlled and two different types of plant dyes are dyed in balance under the same temperature conditions.

[0065] Step 3:

[0066] Heating treatment: The dyed fabric is heated and fixed after dyeing to fix the color of the dye on the fabric, and the dye liquid on the surface of the dyed fabric is dried. The heating time of the heating treatment is 20 minutes and the temperature is 50°C. The dye can be fully fixed on the surface of the fabric through the predetermined time and temperature to complete the dyeing process;

[0067] Step 4:

[0068] Washing treatment: The fixed color fabric needs washing treatment to remove the residual dyes and auxiliaries, and make the fabric reach the required appearance and performance. The washing effect can improve the cleanliness of the fixed color fabric. In the fourth step of washing treatment, the initial water washing temperature is 57℃, and the time is 17min; the soap washing temperature is 77℃, and the time is 25min; the second washing temperature is 40℃, and the time is 15min. Through repeated washing, the residual can be removed first, and the auxiliaries can be cleaned. Secondly, it can be detected whether there is a problem of dye withdrawal after the dye is heated after the fixed color.

[0069] Step 5:

[0070] Drying treatment: The washed fabric will be dried by heating it in a drying oven to 65°C for 30 minutes to dry the dye on the fabric. The drying effect of the fabric can be maintained to the greatest extent by controlling the heating temperature and time.

[0071] Step 6:

[0072] Quality control: After drying, observe the overall completion of the plant dyed fabric to ensure the uniformity of dyeing, color stability and physical properties of the fabric. Through the one-bath dyeing process of the plant dyes under the PH dyeing conditions in step one in the same dye bath, the process flow can be shortened, production efficiency can be improved, and it is easy to adjust, and the dyeing reproducibility is improved.

[0073] Embodiment 4:

[0074] The embodiment of the present invention provides a one-bath dyeing process of plant dyes with different pH values, comprising the following specific steps:

[0075] Step 1:

[0076] Preparation of dye solution: adding surfactant to the dye solution to change the state of dye molecules in the aqueous solution and play a role in slow dyeing to ensure uniform dispersion of the dye and the best dyeing effect, and increasing the dyeing temperature by heating. Adding surfactant and heating is conducive to dyeing balance. The amount of surfactant added in the dyeing process is 2g / L, so that the plant dye can be fully dissolved in the dye bath. The pH value of the solution is weakly acidic or neutral, and the pH value is 7. The one-bath dyeing process of plant dyes with different pH values ​​in the same dye bath can be realized, which can greatly save time and cost compared with the original two-bath dyeing, and the controllability of dyeing can be improved;

[0077] Step 2:

[0078] Dyeing operation: soak the prepared fabric in the dye solution for dyeing. During the dyeing process, the dyeing temperature and time parameters need to be controlled to ensure that the dye can fully penetrate into the fabric. The dyeing temperature is 80°C for 30 minutes. The dyeing temperature is controlled and two different types of plant dyes are dyed in balance under the same temperature conditions.

[0079] Step 3:

[0080] Heating treatment: The dyed fabric is heated and fixed after dyeing to fix the color of the dye on the fabric, and the dye liquid on the surface of the dyed fabric is dried. The heating time of the heating treatment is 20 minutes and the temperature is 55°C. The dye can be fully fixed on the surface of the fabric through the predetermined time and temperature to complete the dyeing process;

[0081] Step 4:

[0082] Washing treatment: The fixed color fabric needs to be washed to remove the residual dyes and auxiliaries, and make the fabric reach the required appearance and performance. The cleanliness of the fixed color fabric is improved by washing. In step 4, the initial washing temperature is 60℃ and the time is 20min; the soap washing temperature is 80℃ and the time is 25min; the second washing temperature is 40℃ and the time is 15min. Through repeated washing, the residual can be removed first, and the auxiliaries can be cleaned. Secondly, whether the dye is returned after the dye is heated after the fixed color is detected;

[0083] Step 5:

[0084] Drying treatment: After washing, the fabric will be dried by heating it in a drying oven to 70°C for 30 minutes to dry the dye on the fabric. The drying effect of the fabric can be maintained to the greatest extent by controlling the heating temperature and time.

[0085] Step 6:

[0086] Quality control: After drying, observe the overall completion of the plant dyed fabric to ensure the uniformity of dyeing, color stability and physical properties of the fabric. Through the one-bath dyeing process of the plant dyes under the PH dyeing conditions in step one in the same dye bath, the process flow can be shortened, production efficiency can be improved, and it is easy to adjust, and the dyeing reproducibility is improved.

[0087] Comparative Example:

[0088] The one-bath dyeing process using plant dyes with different pH values ​​in the manner of Example 1, Example 2, Example 3, Example 4 and the comparative example was performed, and the dyeing effects were observed as shown in Table 1:

[0089] Table 1

[0090] Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Comparative Example Surfactants 1g / L 1.5g / L 1.8g / L 2g / L 0 pH 5 6 7 7 5 Dyeing effect Poor generally good better Unbalanced dyeing

[0091] It can be seen from the results in Table 1 that, in Example 1, Example 2, Example 3 and Example 4, 1-2 g / L of a surfactant is added in the dyeing process to enable the plant dye to be fully dissolved in the dye bath, and a one-bath dyeing process is carried out in the same dye bath, which can shorten the process flow.

[0092] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A one-bath dyeing process using plant dyes of different pH values, characterized in that: The specific steps include: Step 1: Preparation of dye solution: adding surfactant to the dye solution to change the state of dye molecules in the aqueous solution and play a role in slow dyeing to ensure uniform dispersion of the dye and the best dyeing effect, and raising the dyeing temperature by heating, and adding surfactant and heating are beneficial to the dyeing balance; Step 2: Dyeing operation: soak the prepared fabric in the dye solution for dyeing. During the dyeing process, the dyeing temperature and time parameters need to be controlled to ensure that the dye can fully penetrate into the fabric. The dyeing temperature is 70-80℃ and the time is 30min. Step 3: Heating treatment: The dyed fabric is heated to fix the color of the dye on the fabric and dry the dye liquid on the surface of the dyed fabric; Step 4: Washing treatment: Color-fixing fabrics need to be washed to remove residual dyes and auxiliaries, and to achieve the desired appearance and performance of the fabric. Washing can improve the cleanliness of color-fixing fabrics. Step 5: Drying treatment: After washing, the fabric will be dried by heating it in a drying oven to 50-70℃ for 15-30 minutes to dry the dye on the fabric; Step 6: Quality Control: Observe the overall finish of the vegetable dyed fabric after drying to ensure uniformity of dyeing, color stability, and physical properties of the fabric.

2. The one-bath dyeing process of vegetable dyes with different pH values ​​according to claim 1, characterized in that: In the step 1 dyeing process, the amount of surfactant added is 1-2 g / L, so that the plant dye can be fully dissolved in the dye bath.

3. The one-bath dyeing process of vegetable dyes with different pH values ​​according to claim 1, characterized in that: The dyeing temperature is controlled in step 1 and step 2, and two different types of plant dyes are dyed in a balanced manner under the same temperature condition.

4. The one-bath dyeing process of vegetable dyes with different pH values ​​according to claim 1, characterized in that: The pH value of the solution in step 1 is weakly acidic or neutral, and the pH value is 5-7.

5. The one-bath dyeing process of vegetable dyes with different pH values ​​according to claim 1, characterized in that: In the step 4, the water washing treatment, the initial water washing temperature is 50-60°C, and the time is 10-20 minutes; the soap washing temperature is 70-80°C, and the time is 15-25 minutes; the second washing temperature is 30-40°C, and the time is 5-15 minutes.

6. The one-bath dyeing process of vegetable dyes with different pH values ​​according to claim 1, characterized in that: The heating time of step 3 is 20 minutes and the temperature is 35-55°C.